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송한욱,박연규 대한전자공학회 2010 電子工學會論文誌-SC (System and control) Vol.47 No.5
The use of the friction coefficient is known to provide good discrimination ability in the classification of human constitutions, which are used in alternative medicine. In this study, a system that uses a multi-axis load cell and a hemi-circular probe is designed. The equipment consists of a sensor (load cell type, manufactured by the authors), an x-axis linear-bush guide motorized mobile stage that supports the hand being analyzed, and a signal conditioner. Using the proposed system, the friction coefficients from different constitutions were compared, and the relative repeatability error for the friction coefficient measurement was determined to be less than 2 %. The direction along the ring finger line was determined to be the optimum measurement region for a constitutional diagnosis between Tae-eumin and Soyangin types using the proposed system. There were some differences in the friction coefficient between the two constitutions, as reported in ancient literature. The proposed system is applicable to a quantitative constitutional diagnosis between Tae-eumin and Soyangin types within an acceptable level of uncertainty.
송한욱,이정태 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
The importance of a runner’s start was briefly discussed in short distance athletic sports. The main research theme in this field hasmainly been the relationship between the starting signal and the response speed of leg muscles. Records in short distance athleticsports have been improved by training athletes to increase their response speed. However, the improvements in records have also beendue to the athlete’s speed at starting time; thus, there is another way to improve race times through the starting speed. Starting speedis related to the kicking force against the starting blocks at the start. The objectives of this research were to present an equipmentfor measuring forces acting upon a starting block at the start and to optimize the starting conditions for each athlete. To achieve theseobjectives, a starting block with Wheatstone bridge type strain gauges which could measure, in normal and horizontal directions, thepropulsion forces acting on the starting blocks at a starting point in real-time, was developed and showed an uncertainty below 0.4%. The use of this block is expected to correct the posture of each athlete and record important sports dynamics data for each athlete.
Characterization of the Property Degradation of PZT Thin Films with Thickness
송한욱,노광수 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.4
The property degradation of lead zirconate titanate (PZT) thin films with thickness was investigated. PZT thin films were fabricated under the optimum established conditions. PZT thin films with a thickness of less than 30 nm did not show the perovskite phase. When considering the thickness of the reacted layer between the PZT thin film and the Pt bottom electrode of about 10 nm in thickness, a thickness of 30 nm was considerable compared to the critical thickness (18 nm) over which PZT shows ferroelectricity. The degree of (001) orientation increased as the thickness increased due to the competition between the effect of the surface energy and that of the lattice mismatch with Pt(111). The degradation of the ferroelectricity with increasing PZT thickness was investigated. PZT thin films with a thickness of less than 30 nm did not show ferroelectric properties. The remnant polarization decreased and the coercive field increased as the PZT thickness decreased. We speculate that the increase in the residual stress and the decrease in the grain size with decreasing film thickness were the major factors in the decrease in the remnant polarization while the increase in the contribution of the low dielectric layer between the PZT and the bottom electrode contributed most to the increase in the coercive field. The leaky behavior of PZT thin films with thicknesses of less than 30 nm appeared to be due to the existence of metallic Pb at the PZT grain boundary, as observed by X-ray photoelectron spectroscopy.
송한욱,김종호,우삼용 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
최근 수은의 유해성이 대두됨에 따라 저진공분야에서는 수은을 이용하지 않는 새로운 개념의 1차 표준기의 개발이 요구되고 있는 시점이다. 이러한 새로운 압력구현방법 중에 최근 많이 연구되고 있는 것이 매질의 광굴절율을 측정함으로써 매질의 압력을 측정하는 방법이다. KRISS에서는 개발중인 광기반 진공표준기는 두개의 FP형 압력셀을 이용하여 하나는 기준인 진공상태로 유지하고 다른 하나는 임의의 측정압력을 가하여 각 조건에서 기준 요오드 안정화 레이저와 비교하여 beat frequency를 측정함으로써 이를 통해 압력을 측정하는 시스템을 개발하고 있다. 현재 1MHz의 주파수변화가 1Pa의 압력변화에 해당함을 알 수 있었다.